Transmission service

If u plan on never servicing ur tranny again stick with Dexron 3. The type F was/is known for deteriorating seals. When I built Ford trannys years ago if caught soon enough all we really changed were the seals. Then Ford switched to dexron in 1976 or so. Yes it will shift a little better with the F. U may get a little more stall as F is a little thinner. Kim